无法在 Django 中将参数值从一个视图发送到另一个视图

如何解决无法在 Django 中将参数值从一个视图发送到另一个视图

在我的登录视图功能中，我想知道用户在停止访问页面后是否被重定向到这里

这基本上是一个问答网站，如果用户在没有登录的情况下点击“写回答”链接，他将被重定向到登录页面

这里是主应用的views.py

from django.shortcuts import render
from django.http import request,HttpResponseRedirect,HttpResponse
# import the models 
from .models import Question,Answer,Comment
# import paginator for pagination
from django.core.paginator import Paginator
# import forms
from .forms import Write_Answer_form,CommentForm
# import user
from django.contrib.auth.models import User
# import timezone for update function
from django.utils import timezone
# reverse for efficient url redirecting
from django.urls import reverse
from django.shortcuts import redirect


# Create your views here.

# i have deleted some views functions as they seems irrelavant here


def writeAns(request,questionID):
  # check if the user is authenticated
  if request.user.is_authenticated:    
    # get the Question from ID
    RequestedQuestion= Question.objects.get(id= questionID)
    # check if there is a post request from template
    if request.method == 'POST':
      # get all the form data with post request into a variable
      fom= Write_Answer_form(request.POST)
      if fom.is_valid():
        get_save_form_data(RequestedQuestion,request,fom)
        # make a string url to pass as a arguments
        url= '/detail/'+ str(questionID)
        return HttpResponseRedirect(url)
    else:
      # send blank form to template
      fom= Write_Answer_form()
      data= {'form':fom}
      return render(request,'writeAns.html',data)
  
  # if user is not authenticated
  else:
    return redirect('login_page',args=["True"])

验证应用的views.py（我想将重定向值发送到login_page函数）

from django.shortcuts import render
from django.http import request,HttpResponseRedirect
# for user creation & login form
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth import authenticate,login,logout
# for user related Queries
from django.contrib.auth.models import User
from django.urls import reverse
from django.shortcuts import redirect

# imports for test purpose
from django.http import HttpResponse

# Create your views here.

# register page 
def register_Page(request):
    if request.method == 'POST':
        form= UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            username= request.POST['username']
            password= request.POST['password1']
            user= authenticate(request,username=username,password=password)
            login(request,user)
            return HttpResponseRedirect('/')
        else:
            return HttpResponse('Either the user name is not available or you may have filled the form incorrectly')
    else:
        form = UserCreationForm()
        context= {'form':form}
        return render(request,'authentication/register_Page.html',context)

# login page
def login_page(request,redirected=None):
    if request.method == 'POST':
        username= request.POST['username']
        password= request.POST['password']
        # returns user if credentials are valid
        user= authenticate(request,password= password)
        # check if user var contains the user
        if user is not None:
            login(request,user)
            return redirect(reverse('Home_page'))
        else:
            return HttpResponse('Invalid credentials')
    # check if the user is redirected
    if redirected == "True":
        data= {'warning':"please login first"}
        return render(request,'authentication/login.html',data)
    else:
        return render(request,'authentication/login.html')

# logout Page
def log_out(request):
    logout(request)
    return HttpResponseRedirect(reverse('login_page'))

认证的urls.py

from django.urls import path
from authentiCation import views
 
urlpatterns = [
    path('register/',views.register_Page,name='register_Page'),path('login/',views.login_page,name='login_page'),path('logout/',views.log_out,name='logout_page'),]

这里是回溯

Environment:


Request Method: GET
Request URL: http://127.0.0.1:8000/writeAns/5

Django Version: 3.2
Python Version: 3.7.3
Installed Applications:
['django.contrib.admin','django.contrib.auth','django.contrib.contenttypes','django.contrib.sessions','django.contrib.messages','django.contrib.staticfiles','App_wfi_Community','django.contrib.humanize','askQuestion','authentiCation']
Installed Middleware:
['django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.common.CommonMiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback (most recent call last):
  File "/home/saurav/Documents/programming_Projects/WFI-Community/venv/lib/python3.7/site-packages/django/core/handlers/exception.py",line 47,in inner
    response = get_response(request)
  File "/home/saurav/Documents/programming_Projects/WFI-Community/venv/lib/python3.7/site-packages/django/core/handlers/base.py",line 181,in _get_response
    response = wrapped_callback(request,*callback_args,**callback_kwargs)
  File "/home/saurav/Documents/programming_Projects/WFI-Community/App_wfi_Community/views.py",line 114,in writeAns
    return redirect('login_page',args=["True"])
  File "/home/saurav/Documents/programming_Projects/WFI-Community/venv/lib/python3.7/site-packages/django/shortcuts.py",line 41,in redirect
    return redirect_class(resolve_url(to,*args,**kwargs))
  File "/home/saurav/Documents/programming_Projects/WFI-Community/venv/lib/python3.7/site-packages/django/shortcuts.py",line 130,in resolve_url
    return reverse(to,args=args,kwargs=kwargs)
  File "/home/saurav/Documents/programming_Projects/WFI-Community/venv/lib/python3.7/site-packages/django/urls/base.py",line 86,in reverse
    return resolver._reverse_with_prefix(view,prefix,**kwargs)
  File "/home/saurav/Documents/programming_Projects/WFI-Community/venv/lib/python3.7/site-packages/django/urls/resolvers.py",line 694,in _reverse_with_prefix
    raise noreverseMatch(msg)

Exception Type: noreverseMatch at /writeAns/5
Exception Value: Reverse for 'login_page' with keyword arguments '{'args': ['True']}' not found. 1 pattern(s) tried: ['login/$']

错误是

noreverseMatch 在 /writeAns/5

使用关键字参数 '{'args': ['True']}' 反转 'login_page' 未找到。尝试了 1 个模式：['login/$']

解决方法

出于某种原因，人们认为快捷功能 redirect 会在向其传递数据的同时将他们的用户发送到某个其他视图。这不正确。

根据documentation的redirect函数：

返回一个 HttpResponseRedirect 到传递参数的适当 URL。

参数可以是：

模型：模型的get_absolute_url() 函数将被调用。
视图名称，可能带有参数：reverse() 将用于反向解析名称。
绝对或相对 URL，将按原样用于重定向位置。

默认发出临时重定向；将 permanent=True 传递给发出永久重定向。

什么是HttpResponseRedirect？好吧，它只是一个带有 HTTP 302 状态代码和 Location 标头中的 url 的响应，指示他们请求的资源已临时移动到 Location 标头给出的 URL。

如果我们想为用户获取一些数据并将它们重定向到某个地方怎么办？有多种方法可以做到这一点：

使用 GET 参数：

from django.urls import reverse

# While redirecting
return redirect("{}?{}".format(reverse("login_page"),"data=True"))

# At receiving view:
data = request.GET.get("data",False) == "True"

在 session [Django docs] 中为用户存储一些东西：

# While redirecting
request.session['data'] = "True"
return redirect('login_page')

# At receiving view
data = request.session.get('data') == 'True'